Detachable guide air hood

ABSTRACT

A detachable guide air hood, which fits with a fan frame for enhancing heat dissipation, includes a hollow guide air bucket, a fitting part and at least a pair of holding hooks. The hollow guide air bucket provides a large opening and a small opening with two opposite first inclined side walls and two opposite second inclined side walls having a shape of convergence from the large opening to the small opening. The fitting part is disposed at the small opening and provides two opposite first parallel side walls and two opposite second parallel side walls. The parallel side walls are joined to the guide air bucket. The holding hooks are disposed at the joint of the guide air bucket and the fitting part and an end of the respective holding hook is connected to the guide air bucket.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention is related to a detachable guide air hood and particularly to an easily detachable guide air hood, which is capable of being associated with a fan to enhance heat dissipation.

2. Brief Description of the Related Art

Currently, a fan is usually is employed to perform cooling job for a computer. The fan with the rotational shaft thereof is secured with a fan frame. In order to enhance effect of heat dissipation, a guide air hood is used to be incorporated with the fan to direct hot air toward a certain direction. The guide air hood is attached to the fan with screws or wedge projections. The disadvantage of screw fastening is in that hand tools are required for either setting up or being disassembled the guide air hood and the fan frame has to be drilled fixing holes. Thus, it is tedious to fix or detach the guide air hood and the fixing holes easily become larger diameters and loosening engagement. The disadvantage of the wedge projections is in that it is hard to be detached, easy to become loosening and worn out.

SUMMARY OF THE INVENTION

In order to overcome the preceding problems, an object of the present invention is to provide a detachable guide air hood, which is capable of being attached to and detached from a fan frame easily.

Accordingly, a detachable guide air hood according to the present invention, which fits with a fan frame for enhancing heat dissipation, includes a hollow guide air bucket, a fitting part and at least a pair of holding hooks. The hollow guide air bucket provides a large opening and a small opening with two opposite first inclined side walls and two opposite second inclined side walls having a shape of convergence from the large opening to the small opening. The fitting part is disposed at the small opening and provides two opposite first parallel side walls and two opposite second parallel side walls. The parallel side walls are joined to the guide air bucket. The holding hooks are disposed at the joint of the guide air bucket and the fitting part and an end of the respective holding hook is connected to the guide air bucket.

Next, the detachable guide air hood according to the present invention provides a stop plate at the inner sides of the joint of the guide air bucket and the fitting part to be perpendicular to the fitting part.

Further, the detachable guide air hood according to the present invention provides a locating recess at four corners of the fitting part corresponding to four corners of the fan frame.

Further, the detachable guide air hood according to the present invention provides a guide air hood, which has a cross section of parallelogram.

Further, the detachable guide air hood according to the present invention provides holding hooks joined to the guide air bucket are diagonally adjacent to each other.

Further, the detachable guide air hood according to the present invention provides a guide air hood, which has a cross section of parallelogram.

Further, the detachable guide air hood according to the present invention is capable of being set up with the holding hooks engaging with locating grooves provided in the fan frame for keeping good engagement without the hand tools and being less worn out.

BRIEF DESCRIPTION OF THE DRAWINGS

The detail structure, the applied principle, the function and the effectiveness of the present invention can be more fully understood with reference to the following description and accompanying drawings, in which:

FIG. 1 is a perspective view of a preferred embodiment of a detachable guide air hood according to the present invention;

FIG. 2 is an enlarged view of the encircled area shown in FIG. 1;

FIG. 3 is a perspective view illustrating the guide air hood of the invention in association with a fan and the fixing frame thereof;

FIG. 4 is a fragmentary perspective view illustrating the guide air hood engaging with the fixing frame; and

FIG. 5 is an enlarged view of the encircled area shown in FIG. 4.

DETAILED DESCRIPTION OF THE INVENTION

Referring to FIGS. 1 to 5, a detachable guide fan hood provides a hollow hood member 10, which is composed of a guide air bucket 11 and a fitting part 12. The guide air bucket 11 has two opposite first inclined side walls 111 and two opposite second inclined side walls 112 to form a quadrilateral shape cone with cross section of a non-rectangular parallelogram such that a convergence is formed from the upper opening to the lower opening thereof. The fitting part 12 is disposed at the lower opening of the guide air bucket 11 and is formed with two opposite first parallel side walls 121 and two opposite second parallel side walls 122.

A pair of L-shaped holding hooks 13 are provided at one of the first inclined side walls 111 and at one of the second inclined side walls 112 respectively in a way of the holding hooks 13 are disposed diagonally adjacent to each other. The upper end of the respective holding hook 13 extends from the inclined side walls 111, 112 and the lower end of the holding hook 13 is an inverted hook end 131 being flush with the free ends of the parallel side walls 121, 122 to correspond to the inclined side walls 111, 112 with the holding hooks 13.

The fitting part 12 has a lower recess 123 at four corners thereof respectively for accommodating four corners of the frame 20 of the fan. The inner side of the respective parallel side wall 121, 122 extends a stop plate 14 perpendicularly for axially locating the guide air hood with the frame of the fan.

Once the lower end of the fitting part 12 fits with the fan frame 20, the guide air hood is moved downward slightly till the holding hook 13 tightly engaging with a locating groove 21 disposed at the outer side of the fan frame 20 and corresponding to the holding hook 13. In case of the guide air hood being detached from the fan frame 20, the holding hook 13 is moved outward the locating groove 21 with both hands and pushed upward at the same time. In this way, the guide air fan is capable of being taken out smoothly.

While the invention has been described with referencing to preferred embodiments thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims. 

1. A detachable guide air hood, which fits with a fan frame for enhancing heat dissipation, comprising: a hollow guide air bucket providing a large opening and a small opening with two opposite first inclined side walls and two opposite second inclined side walls having a shape of convergence from the large opening to the small opening; a fitting part being disposed at the small opening, providing two opposite first parallel side walls and two opposite second parallel side walls, which are joined to the guide air bucket; and at least a pair of L-shaped holding hooks being disposed at an intersection of the guide air bucket and the fitting part with an end of the respective holding hook being connected to the guide air bucket.
 2. The detachable guide air hood as defined in claim 1, wherein the first and second parallel side walls perpendicularly extend a stop plate at the inner sides thereof at the intersection.
 3. The detachable guide air hood as defined in claim 1, wherein the fitting part has a locating recess at four corners thereof corresponding four corners of the fan frame.
 4. The detachable guide air hood as defined in claim 1, wherein the holding hooks are joined to one of the first inclined side walls and one of the second inclined side wall such that the holding hooks are diagonally adjacent to each other.
 5. The detachable guide air hood as defined in claim 1, wherein the fitting part has a cross section of rectangle. 